package com.seafood.service.impl;

import com.seafood.dto.*;
import com.seafood.service.MapService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

import java.math.BigDecimal;
import java.math.RoundingMode;
import java.util.*;
import java.util.stream.Collectors;

/**
 * 地图服务实现（模拟实现）
 */
@Slf4j
@Service
public class MapServiceImpl implements MapService {
    
    // 模拟的城市坐标数据
    private static final Map<String, Map<String, BigDecimal>> CITY_COORDINATES;
    
    static {
        CITY_COORDINATES = new HashMap<>();
        
        Map<String, BigDecimal> beijing = new HashMap<>();
        beijing.put("lat", new BigDecimal("39.904200"));
        beijing.put("lon", new BigDecimal("116.407396"));
        CITY_COORDINATES.put("北京市", beijing);
        
        Map<String, BigDecimal> shanghai = new HashMap<>();
        shanghai.put("lat", new BigDecimal("31.230416"));
        shanghai.put("lon", new BigDecimal("121.473701"));
        CITY_COORDINATES.put("上海市", shanghai);
        
        Map<String, BigDecimal> shenzhen = new HashMap<>();
        shenzhen.put("lat", new BigDecimal("22.543099"));
        shenzhen.put("lon", new BigDecimal("114.057868"));
        CITY_COORDINATES.put("深圳市", shenzhen);
        
        Map<String, BigDecimal> guangzhou = new HashMap<>();
        guangzhou.put("lat", new BigDecimal("23.129163"));
        guangzhou.put("lon", new BigDecimal("113.264435"));
        CITY_COORDINATES.put("广州市", guangzhou);
        
        Map<String, BigDecimal> hangzhou = new HashMap<>();
        hangzhou.put("lat", new BigDecimal("30.274084"));
        hangzhou.put("lon", new BigDecimal("120.155070"));
        CITY_COORDINATES.put("杭州市", hangzhou);
        
        Map<String, BigDecimal> dalian = new HashMap<>();
        dalian.put("lat", new BigDecimal("38.914003"));
        dalian.put("lon", new BigDecimal("121.618622"));
        CITY_COORDINATES.put("大连市", dalian);
    }
    
    @Override
    public GeocodingResponseDTO geocoding(GeocodingRequestDTO requestDTO) {
        log.info("执行地理编码: address={}", requestDTO.getAddress());
        
        GeocodingResponseDTO response = new GeocodingResponseDTO();
        response.setStatus("success");
        response.setMessage("地理编码成功");
        
        // 模拟地理编码结果
        GeocodingResponseDTO.GeocodingResultDTO result = new GeocodingResponseDTO.GeocodingResultDTO();
        
        // 简单的地址解析逻辑
        String address = requestDTO.getAddress();
        Map<String, BigDecimal> coordinates = extractCoordinatesFromAddress(address);
        
        result.setFormattedAddress(address);
        result.setLatitude(coordinates.get("lat"));
        result.setLongitude(coordinates.get("lon"));
        result.setAccuracy(8); // 精度级别
        result.setAddressType("地址");
        
        // 解析省市区信息
        parseAddressComponents(address, result);
        
        // 模拟POI信息
        if (requestDTO.getNeedPoi()) {
            result.setPois(generateMockPois(coordinates.get("lat"), coordinates.get("lon")));
        }
        
        response.setResults(Collections.singletonList(result));
        return response;
    }
    
    @Override
    public GeocodingResponseDTO reverseGeocoding(ReverseGeocodingRequestDTO requestDTO) {
        log.info("执行逆地理编码: lat={}, lon={}", requestDTO.getLatitude(), requestDTO.getLongitude());
        
        GeocodingResponseDTO response = new GeocodingResponseDTO();
        response.setStatus("success");
        response.setMessage("逆地理编码成功");
        
        GeocodingResponseDTO.GeocodingResultDTO result = new GeocodingResponseDTO.GeocodingResultDTO();
        
        // 模拟逆地理编码：根据坐标生成地址
        String mockAddress = generateMockAddress(requestDTO.getLatitude(), requestDTO.getLongitude());
        result.setFormattedAddress(mockAddress);
        result.setLatitude(requestDTO.getLatitude());
        result.setLongitude(requestDTO.getLongitude());
        result.setAccuracy(8);
        
        // 解析省市区信息
        parseAddressComponents(mockAddress, result);
        
        // 模拟POI信息
        if (requestDTO.getNeedPoi()) {
            result.setPois(generateMockPois(requestDTO.getLatitude(), requestDTO.getLongitude()));
        }
        
        response.setResults(Collections.singletonList(result));
        return response;
    }
    
    @Override
    public List<GeocodingResponseDTO> batchGeocoding(List<GeocodingRequestDTO> requests) {
        return requests.stream()
                .map(this::geocoding)
                .collect(Collectors.toList());
    }
    
    @Override
    public Double calculateDistance(BigDecimal lat1, BigDecimal lon1, BigDecimal lat2, BigDecimal lon2) {
        // 使用Haversine公式计算球面距离
        double earthRadius = 6371; // 地球半径（公里）
        
        double dLat = Math.toRadians(lat2.doubleValue() - lat1.doubleValue());
        double dLon = Math.toRadians(lon2.doubleValue() - lon1.doubleValue());
        
        double a = Math.sin(dLat / 2) * Math.sin(dLat / 2) +
                   Math.cos(Math.toRadians(lat1.doubleValue())) * Math.cos(Math.toRadians(lat2.doubleValue())) *
                   Math.sin(dLon / 2) * Math.sin(dLon / 2);
        
        double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
        
        return earthRadius * c;
    }
    
    @Override
    public Map<String, Object> calculateRoute(List<LocationAddressDTO> waypoints, String routeType) {
        log.info("计算路径规划: waypoints={}, routeType={}", waypoints.size(), routeType);
        
        Map<String, Object> routeInfo = new HashMap<>();
        
        if (waypoints.size() < 2) {
            routeInfo.put("status", "error");
            routeInfo.put("message", "至少需要2个路径点");
            return routeInfo;
        }
        
        // 模拟路径计算
        double totalDistance = 0;
        int totalTime = 0;
        List<Map<String, Object>> steps = new ArrayList<>();
        
        for (int i = 0; i < waypoints.size() - 1; i++) {
            LocationAddressDTO from = waypoints.get(i);
            LocationAddressDTO to = waypoints.get(i + 1);
            
            double distance = calculateDistance(from.getLatitude(), from.getLongitude(),
                                              to.getLatitude(), to.getLongitude());
            
            totalDistance += distance;
            totalTime += (int) (distance * 2); // 假设平均时速30km/h
            
            Map<String, Object> step = new HashMap<>();
            step.put("from", from.getFormattedAddress());
            step.put("to", to.getFormattedAddress());
            step.put("distance", String.format("%.2f", distance));
            step.put("duration", (int) (distance * 2));
            steps.add(step);
        }
        
        routeInfo.put("status", "success");
        routeInfo.put("totalDistance", String.format("%.2f", totalDistance) + " km");
        routeInfo.put("totalTime", totalTime + " minutes");
        routeInfo.put("routeType", routeType);
        routeInfo.put("steps", steps);
        
        return routeInfo;
    }
    
    @Override
    public Map<String, Object> getAdministrativeInfo(String province, String city, String district) {
        log.info("获取行政区划信息: province={}, city={}, district={}", province, city, district);
        
        Map<String, Object> adminInfo = new HashMap<>();
        adminInfo.put("province", province);
        adminInfo.put("city", city);
        adminInfo.put("district", district);
        adminInfo.put("provinceCode", generateProvinceCode(province));
        adminInfo.put("cityCode", generateCityCode(city));
        adminInfo.put("districtCode", generateDistrictCode(district));
        adminInfo.put("level", determineAdminLevel(province, city, district));
        
        return adminInfo;
    }
    
    @Override
    public Map<String, BigDecimal> convertCoordinates(BigDecimal latitude, BigDecimal longitude, 
                                                     String fromCoordType, String toCoordType) {
        log.info("坐标系转换: lat={}, lon={}, from={}, to={}", latitude, longitude, fromCoordType, toCoordType);
        
        // 模拟坐标系转换（实际应使用专业的坐标转换库）
        Map<String, BigDecimal> converted = new HashMap<>();
        
        if (fromCoordType.equals(toCoordType)) {
            converted.put("latitude", latitude);
            converted.put("longitude", longitude);
        } else {
            // 简单的偏移模拟（实际转换需要复杂的数学公式）
            BigDecimal latOffset = new BigDecimal("0.0001");
            BigDecimal lonOffset = new BigDecimal("0.0001");
            
            converted.put("latitude", latitude.add(latOffset));
            converted.put("longitude", longitude.add(lonOffset));
        }
        
        return converted;
    }
    
    @Override
    public List<GeocodingResponseDTO.PoiInfoDTO> searchNearbyPoi(BigDecimal latitude, BigDecimal longitude, 
                                                               String keyword, Integer radius) {
        log.info("搜索周边POI: lat={}, lon={}, keyword={}, radius={}", latitude, longitude, keyword, radius);
        
        return generateMockPois(latitude, longitude);
    }
    
    @Override
    public List<String> getAddressSuggestions(String keyword, String city) {
        log.info("获取地址建议: keyword={}, city={}", keyword, city);
        
        // 模拟地址建议
        List<String> suggestions = new ArrayList<>();
        
        if (keyword.length() >= 2) {
            suggestions.add(city + keyword + "路123号");
            suggestions.add(city + keyword + "大厦");
            suggestions.add(city + keyword + "商场");
            suggestions.add(city + keyword + "公园");
            suggestions.add(city + keyword + "站");
        }
        
        return suggestions;
    }
    
    @Override
    public boolean validateCoordinates(BigDecimal latitude, BigDecimal longitude) {
        if (latitude == null || longitude == null) {
            return false;
        }
        
        return latitude.compareTo(new BigDecimal("-90")) >= 0 &&
               latitude.compareTo(new BigDecimal("90")) <= 0 &&
               longitude.compareTo(new BigDecimal("-180")) >= 0 &&
               longitude.compareTo(new BigDecimal("180")) <= 0;
    }
    
    @Override
    public Map<String, Object> getLocationWeather(BigDecimal latitude, BigDecimal longitude) {
        log.info("获取位置天气: lat={}, lon={}", latitude, longitude);
        
        // 模拟天气信息
        Map<String, Object> weather = new HashMap<>();
        weather.put("temperature", "22°C");
        weather.put("humidity", "65%");
        weather.put("weather", "晴天");
        weather.put("windSpeed", "3级");
        weather.put("airQuality", "良");
        weather.put("pressure", "1013hPa");
        
        return weather;
    }
    
    // 辅助方法
    private Map<String, BigDecimal> extractCoordinatesFromAddress(String address) {
        // 简单的地址识别逻辑
        for (Map.Entry<String, Map<String, BigDecimal>> entry : CITY_COORDINATES.entrySet()) {
            if (address.contains(entry.getKey().replace("市", ""))) {
                return entry.getValue();
            }
        }
        
        // 默认返回北京坐标
        return CITY_COORDINATES.get("北京市");
    }
    
    private void parseAddressComponents(String address, GeocodingResponseDTO.GeocodingResultDTO result) {
        // 简单的地址解析
        if (address.contains("北京")) {
            result.setProvince("北京市");
            result.setCity("北京市");
        } else if (address.contains("上海")) {
            result.setProvince("上海市");
            result.setCity("上海市");
        } else if (address.contains("广东") || address.contains("深圳") || address.contains("广州")) {
            result.setProvince("广东省");
            if (address.contains("深圳")) {
                result.setCity("深圳市");
            } else if (address.contains("广州")) {
                result.setCity("广州市");
            }
        } else {
            result.setProvince("未知省份");
            result.setCity("未知城市");
        }
    }
    
    private String generateMockAddress(BigDecimal latitude, BigDecimal longitude) {
        // 根据坐标生成模拟地址
        String[] provinces = {"北京市", "上海市", "广东省", "浙江省", "江苏省"};
        String[] districts = {"朝阳区", "海淀区", "黄浦区", "浦东新区", "南山区"};
        String[] streets = {"中山路", "解放路", "人民路", "建设路", "和平路"};
        
        Random random = new Random(latitude.multiply(longitude).longValue());
        
        String province = provinces[random.nextInt(provinces.length)];
        String district = districts[random.nextInt(districts.length)];
        String street = streets[random.nextInt(streets.length)];
        int number = random.nextInt(999) + 1;
        
        return province + district + street + number + "号";
    }
    
    private List<GeocodingResponseDTO.PoiInfoDTO> generateMockPois(BigDecimal latitude, BigDecimal longitude) {
        List<GeocodingResponseDTO.PoiInfoDTO> pois = new ArrayList<>();
        
        String[] poiNames = {"星巴克咖啡", "麦当劳", "中国银行", "便利店", "药店"};
        String[] poiTypes = {"餐饮", "餐饮", "金融", "购物", "医疗"};
        
        for (int i = 0; i < poiNames.length; i++) {
            GeocodingResponseDTO.PoiInfoDTO poi = new GeocodingResponseDTO.PoiInfoDTO();
            poi.setName(poiNames[i]);
            poi.setType(poiTypes[i]);
            poi.setLatitude(latitude.add(new BigDecimal("0.00" + (i + 1))));
            poi.setLongitude(longitude.add(new BigDecimal("0.00" + (i + 1))));
            poi.setDistance((i + 1) * 100);
            poi.setAddress("模拟地址" + (i + 1));
            
            pois.add(poi);
        }
        
        return pois;
    }
    
    private String generateProvinceCode(String province) {
        return "P" + String.format("%02d", Math.abs(province.hashCode() % 100));
    }
    
    private String generateCityCode(String city) {
        return "C" + String.format("%04d", Math.abs(city.hashCode() % 10000));
    }
    
    private String generateDistrictCode(String district) {
        return "D" + String.format("%06d", Math.abs(district.hashCode() % 1000000));
    }
    
    private String determineAdminLevel(String province, String city, String district) {
        if (district != null && !district.isEmpty()) {
            return "区县级";
        } else if (city != null && !city.isEmpty()) {
            return "市级";
        } else if (province != null && !province.isEmpty()) {
            return "省级";
        } else {
            return "未知级别";
        }
    }
}